B0176

Circuit Description

When the ignition is ON, the heater and A/C control module will detect this fault any time that CKT 404 is at or near 5 volts or higher. Refer to Sensor Resistance Table. Sensor Resistance Tables - Electronic Climate Control (ECC)

Conditions for Setting the DTC

When the ignition is ON, the heater and A/C control module will detect DTC B0176 any time that CKT 404 is at or near 5 volts or higher.

Action Taken When the DTC Sets

The heater and A/C control module will use a default value of 10 A/D counts until the fault is cleared.

Conditions for Clearing the MIL/DTC

This fault will clear as soon as the fault goes away or has been repaired. The system will then return to normal operation. History DTCs can only be cleared by removing and restoring B+ or by using the scan tool.

Diagnostic Aids

- The heater and A/C control module may set class 2 lost communication DTCs when the Body Control Module (BCM) or the VCM is being reprogrammed. After reprogramming, inspect for DTCs in the heater and A/C control module. Clear any history U DTCs, then resume diagnostics.
- Visually inspect the sensor connector and harness for corrosion and damage. The resistance value of the sensor must be 334-100,865 Ohms. Refer to the Temperature vs Resistance Table. If resistance is not within specifications replace the sensor. Sensor Resistance Tables - Electronic Climate Control (ECC)

Test Description

The numbers below refer to the step numbers on the diagnostic table.

1. This step measures the resistance of output air temperature sensor # 1.
2. This step inspects for B+ on CKT 404.
3. This step determines if the short to B+ is in CKT 404 or in the heater and A/C control module.
4. This step inspects for an open in CKT 552.
5. This step replaces a defective output air temperature sensor # 1.
6. This step repairs an open in CKT 552.
7. This step inspects for Intermittents and tests for a malfunctioning heater and A/C control module.
8. This step replaces a defective heater and A/C control module.
9. This step inspects for 5 volts on CKT 404.
10. This step determines if the open is in CKT 404 or in the heater and A/C control module.